package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 定义切点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /**
     * 前置通知，在通知中进行公共字段的填充
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段的填充...");

        // 获取拦截方法的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); //获取方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获取方法的注解对象
        OperationType operationType = autoFill.value(); //获取数据库操作类型

        // 获取拦截方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object object = args[0];

        // 准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        // 根据不同的操作类型，为对应的属性通过反射赋值
        if (operationType == OperationType.INSERT) {
            // 插入数据，为四个属性赋值
            try {
                Method setCreateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = object.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUSer = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射为对象属性赋值
                setCreateTime.invoke(object, now);
                setCreateUser.invoke(object, currentId);
                setUpdateTime.invoke(object, now);
                setUpdateUSer.invoke(object, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        } else if (operationType == OperationType.UPDATE) {
            // 更新数据，为两个属性赋值
            try {
                Method setUpdateTime = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUSer = object.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                // 通过反射为对象属性赋值
                setUpdateTime.invoke(object, now);
                setUpdateUSer.invoke(object, currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

    }

}
